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d8dd36459d
Replace the bit left shift operation with the BIT_ULL() macro and remove the unnecessary mask off operation against the bit_nr variable. This mask is only there for legacy reasons. Originally it was 31 (0x1f) and the bit_nr variable spread across an mc_filter array with two u32 elements. Now, this mask is not needed because its value is 0x3f and the mc_filter variable is an u64 type. In this situation, the 26 bit right shift operation against the value returned by the ether_crc function set the bit_nr variable to the following value: bit 31 to bit 6 -> All 0 (due to the bit shift operation happens over an unsigned type). bit 5 to bit 0 -> The 6 msb bits of the value returned by the ether_crc function. The purpose of the 0x3f mask against the bit_nr variable is to reset (set to 0) the 26 msb bits (bit 31 to bit 6), but these bits are yet 0. So, the mask off operation is now unnecessary. Signed-off-by: Oscar Carter <oscar.carter@gmx.com> Link: https://lore.kernel.org/r/20200314161441.4870-1-oscar.carter@gmx.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.